Antisiphonic liquid-seal trap



Nmnfl,I 1930. J. McDERMlD Annsrrnonxc LIQUID SEAL um' Filed latch 14, 1930 HTTOR/VE YS.

Patented Nov. 1s, 1930 unifi-ln stares LPMENTr OFFICE' JOHN Mennmviln, on ENNERDALE, ENGLAND ANTIsIPnoNIe LIQUID-SEAL TRAP Application nien March 14, 1930, seriai No. 435,777,` anain Great Britain Marches, 1929. f

This invention relates to sanitary liquid traps and more particularly to traps of the type in which liquid seals are provided in U- y shaped or other shaped bends interposed be- 6 tween the inlet and outletends of the pipe and in which, 111 orderto prevent unsealing j,

of the trap, an external antisiphoning pipe is used, connecting a point above the water level in the outlet side of the pipe to a point 10 Vbelow the water level on the inlet side of the pipe, and in which a chamber is' provided inV be connected to the top of the chamber or to one side thereof, and the chamber may be detachable 'from the trapfltting, in which case provision 'is preferably made for adjustabily ityr of the chamber on its aXis to provide for varyingl distances between the inlet of thev trap and its outlet.

` Tn order that the invention may be clearlyV understood referencey will now be made 'to` the accompanying drawings which illustrate embodiments which Fig. 1 is a side an antisiphoning trap as applied to a lavatory basin, sink or the like. l

Fig. shows a front elevation partly in section of thesame.

Fig. 3 shows a side elevation partly in section of asimilar trap suitable for a bath.

Fig. 4c shows a front elevation partly in secl tion of the same. y v i l Referring more particularly toFigs. 1 and 5 2, ais a U-shaped pipe fitted at the end of its inlet limb withy a union` nut `b and at thev end of its outlet limb with a union nuto.

By means of the union nut 0 the outlet limb of the U-shaped pipe ais connected to a neel;

at the bottom of a chamber d of larger diam- 4ot lthe yinventionv and in` elevation partly insection ofl eter thanythe pipe a. This chamberd is pref:v

eiably, as shown, of spherical shape.

On one side the chamberd is provided with a neck iitted with a yunion nut e whereby it is Vconnected to an extension' pipe f. a

" 1 vThe chamber dis also provided on top with l a neel` diametricallyopposite and coaxial i' with ythe neck at the bottom and fitted withV a union nut g.

An antisiphoning neeted by the union nut g to the top of the chamber d, andat its'other end by -a union nut e' to a neclrfon the side of the lower por?- pipe l1. is at one endk con;

tion of the inlet limb ofthe Ushaped pipe a. f

Owing tothe coaxial alignment ofthel union nuts c. and g, the chamber d canl be rotated about theaXisof said nuts so that the extension pipe f can .be joined'to a Waste pipe orother plumbing fitting at varying distances from the axis ofthe the U-shaped pipeva. f ,y

The union nuts g and z' permit the antisiphoning pipeiJV to be detached from the chamber d and Ueshaped pipe a in the event of such pipe L or the trap a or outlet eX- tension pipe f becoming choked.l

f" The bulbousenlargeinent provided lby the chamber Z enablessuli'icient liquidV to be retained to provide a kseal. atten discharge through the trap-has taken place.

The Vant'isiphoninggfpipe lL-serves to restore atmospheric' pressure above the :liquid in the chamber ZY as soon as vthe liquid level in the inlet limb -of ,the U''sha'ped pipe a has deseend'ed', belowv andunc'overed the lower ,end-vv.

of the'antisiphoning pipe 7L, and thus'pre.- vents the liquid'siphoning out fofrthe trap and down thepipe f.. V1 v In the modification shown in Figs. 3 and inietlnnb of im 'l 4t, the antisiphoning pipe v is connected to-e the side of the chamber d instead of to the top thereof. Rotational .adjustment of the chamber d is therefore precluded. This form yof construction is more suitable where absence of space does not permit of the anti-1. siphoning pipe being connected to the top ofV thev chamber d, such for instance as in bathtraps.

1 The trap, spherical chamber and extension y fitting can be constructed of any suitable ma.-

terial such aslead, iron, brass, copper, earthenw'are, or the like, and can be formed in Various sizes to suitdifferent requirements. I claim: l. In an antisiphoning trap, a U-shape pipe, a chamber of largei` diameter than said U-shaped pipe connected to the outlet limb of said UV-shaped pipe, an antisiphoning pipe detaohably connected to the lower portion of the inlet limb of said U-shaped pipe and to said chamber, and an outlet pipe Conneoted to said chamber.

2. In an antisiphoning trap, an U-shaped pipe, a spherical chamber of larger diameter than said U-shaped pipe Connected to the outlet limb of said U-shaped pipe, an antisiphoning pipe `.detaehably connected to they lower portion of the inlet limb of Vsaid U- shaped pipe and to said chamber, and an outlet pipeconnected to said chamber.

3. In anantisiphoning trap, a U-shaped p1pe,a chamber oi'xlarger diameter than said U-shaped piper detachably Connected to the t outlet limb of said U-shaped pipe, an anti- ;V Y 1 Alower portion of the inlet limb of said-Uf` siphoning pipe detaohably connected to the shaped pipe and. to said chamber, and an Chamber. Y l

4L In an. antisiphoning trap, a U-shaped `i e a chamber of larve'r diameter thansaid Y. siphoning pipe detaehably connected to the l lower portion of the inlet limb of `said U shaped pipe and to the topvof said chamber U-shaped pipe detaehably Connected to the outlet limb of said 'U-shaped pipe, an antiin axial alignment with the-,connection thereof to-the outlet limb of said U-shaped pipe,

` and an outlet pipe connected to said chamber. -V

5. In an antisiphoning trap, a U-shaped pipe, aspherieal cliamberof larger diameter than said U-shaped pipe detaehably connect ed to the outlet limb of said Ushaped pipe,

an antisiphoning pipe detaehably connected to the lower portion of the inlet limb oi said U-shaped pipe and to the top of said chamber in axial alignment with the Connection thereof to the outlet limb of said U-shaped pipe,

and anfoutlet pipe connected to said chamber. 1

In testimony whereof I have signed my name to this specification.

Y JOHN MQDERMiD.

piperfd'etac'zhablyV connected to said v y 

